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Fat Kid 'Fitness' Sickness 

commonly known as FKFS
-The effect when a fat (or relatively large) kid thinks that playing the wii will make you fit.
-may cause sudden attempts (from that fat kid) of actually being athletic when clearly their are not.
'wow nathan tottaly has Fat kid 'fitness' sickness (FKFS) he tryed to flex for some girls because he stayed up all night playing wii fit

U.D. Editor Sickness 

The feeling you get after making too many decisions and reading stupid definitions on the U.D. as an urban dictioary editor. Mostly the U.D. Editor Sickness gives you a stomach ache, head ache, and your feet get cold and sweaty. Sometimes you feel tired and your mouth tastes like stale Doritos. Could be cured by listening to "Down with the Sickness" by Disturbed and drinking water.
guy: "Last night I made 1,000 decisions on the U.D., then I threw up"

Dude: "Sounds like you got U.D. Editor Sickness. Listen to Disturbed and drink some liquids, man!"
U.D. Editor Sickness by blu3hat October 19, 2010

turtle sickness

Turtle sickness is a result of sleeping too much or not getting out of bed until 2:00 or 3:00 pm. It is the feeling of still being tired even if you've slept for 10 or 12 hours. Your behavior and brain functions are noticably slowed down and reactionary time is also deminished.
She just woke up and she still looks tired - she must have turtle sickness.

Homie Sickness 

A derivative of home sickness, a term used for the feelings of melancholy and nostaligia when one is apart from their friends.
Matt went to visit his parents this weekend, and I'm getting serious homie sickness.
Homie Sickness by Oliviana September 16, 2017

Decompression Sickness 

A condition starting from dissolved gases coming out of solution into bubbles inside the human body on depressurization.
"Divers get Decompression Sickness from rapidly rising toward the surface."

Jackie Sickness 

Jackie Sickness is when you are attracted to a fictional character or animal. Sometimes both at the same time.
Girl 1: I’m attracted to Cat Noir.

Girl: 2 Oh, you have Jackie Sickness.
Jackie Sickness by Hxe_Maden March 26, 2021